I posted this on the UserEcho site, but I thought it would be worth reposting here to spread the idea a bit:

Xcode (the Objective-C IDE) has a great feature where you can simultaneously edit all occurrences of a string at once within a given scope. This is really handy when renaming method parameters or variable names — it saves a lot of time, and prevents any of the mishaps that Find and Replace and introduce. This would be a great addition to Sublime Text 2...